import { getLikeButton, getDislikeButton, getButtons } from "./buttons";
import { createRateBar } from "./bar";
import {
  getBrowser,
  getVideoId,
  cLog,
  numberFormat,
  getColorFromTheme,
} from "./utils";
import { sendVideoIds } from "./events";

//TODO: Do not duplicate here and in ryd.background.js
const apiUrl = "https://returnyoutubedislikeapi.com";
const LIKED_STATE = "LIKED_STATE";
const DISLIKED_STATE = "DISLIKED_STATE";
const NEUTRAL_STATE = "NEUTRAL_STATE";

const DISLIKES_DISABLED_TEXT = "DISLIKES DISABLED";

let extConfig = {
  disableVoteSubmission: false,
  coloredThumbs: false,
  coloredBar: false,
  colorTheme: "classic",
  numberDisplayFormat: "compactShort",
  numberDisplayRoundDown: true,
};

let storedData = {
  likes: 0,
  dislikes: 0,
  previousState: NEUTRAL_STATE,
};

let likesDisabledState = true;

function isMobile() {
  return location.hostname == "m.youtube.com";
}

function isShorts() {
  return location.pathname.startsWith("/shorts");
}

let mutationObserver = new Object();

if (isShorts() && mutationObserver.exists !== true) {
  cLog('initializing mutation observer')
  mutationObserver.options = {
    childList: false,
    attributes: true,
    subtree: false
  };
  mutationObserver.exists = true;
  mutationObserver.observer = new MutationObserver( function(mutationList, observer) {
    mutationList.forEach( (mutation) => {
      if (mutation.type === 'attributes' && 
        mutation.target.nodeName === 'TP-YT-PAPER-BUTTON' && 
        mutation.target.id === 'button') {
        // cLog('Short thumb button status changed');
        if (mutation.target.getAttribute('aria-pressed') === 'true') {
          mutation.target.style.color =
            (mutation.target.parentElement.parentElement.id === 'like-button') ? 
            getColorFromTheme(true) : getColorFromTheme(false);
        } else {
          mutation.target.style.color = 'unset';
        }
        return;
      }
      cLog('unexpected mutation observer event: ' + mutation.target + mutation.type);
    });
  });
}

function isVideoLiked() {
  if (isMobile()) {
    return (
      getLikeButton().querySelector("button").getAttribute("aria-label") ==
      "true"
    );
  }
  return getLikeButton().classList.contains("style-default-active");
}

function isVideoDisliked() {
  if (isMobile()) {
    return (
      getDislikeButton().querySelector("button").getAttribute("aria-label") ==
      "true"
    );
  }
  return getDislikeButton().classList.contains("style-default-active");
}

function getState(storedData) {
  if (isVideoLiked()) {
    return { current: LIKED_STATE, previous: storedData.previousState };
  }
  if (isVideoDisliked()) {
    return { current: DISLIKED_STATE, previous: storedData.previousState };
  }
  return { current: NEUTRAL_STATE, previous: storedData.previousState };
}

//---   Sets The Likes And Dislikes Values   ---//
function setLikes(likesCount) {
  getButtons().children[0].querySelector("#text").innerText = likesCount;
}

function setDislikes(dislikesCount) {
  if (!likesDisabledState) {
    if (isMobile()) {
      getButtons().children[1].querySelector(
        ".button-renderer-text"
      ).innerText = dislikesCount;
      return;
    }
    getButtons().children[1].querySelector("#text").innerText = dislikesCount;
  } else {
    cLog("likes count disabled by creator");
    if (isMobile()) {
      getButtons().children[1].querySelector(
        ".button-renderer-text"
      ).innerText = DISLIKES_DISABLED_TEXT;
      return;
    }
    getButtons().children[1].querySelector("#text").innerText =
      DISLIKES_DISABLED_TEXT;
  }
}

function getLikeCountFromButton() {
  if (isShorts()) {
    //Youtube Shorts don't work with this query. It's not nessecary; we can skip it and still see the results.
    //It should be possible to fix this function, but it's not critical to showing the dislike count.
    return 0;
  }
  let likesStr = getLikeButton()
    .querySelector("button")
    .getAttribute("aria-label")
    .replace(/\D/g, "");
  return likesStr.length > 0 ? parseInt(likesStr) : false;
}

function processResponse(response, storedData) {
  const formattedDislike = numberFormat(response.dislikes);
  setDislikes(formattedDislike);
  storedData.dislikes = parseInt(response.dislikes);
  storedData.likes = getLikeCountFromButton() || parseInt(response.likes);
  createRateBar(storedData.likes, storedData.dislikes);
  if (extConfig.coloredThumbs === true) {
    if (isShorts()) { // for shorts, leave deactived buttons in default color
      let shortLikeButton = getLikeButton().querySelector('tp-yt-paper-button#button');
      let shortDislikeButton = getDislikeButton().querySelector('tp-yt-paper-button#button');
      if (shortLikeButton.getAttribute('aria-pressed') === 'true') {
        shortLikeButton.style.color = getColorFromTheme(true);
      }
      if (shortDislikeButton.getAttribute('aria-pressed') === 'true') {
        shortDislikeButton.style.color = getColorFromTheme(false);
      }
      mutationObserver.observer.observe(shortLikeButton, mutationObserver.options);
      mutationObserver.observer.observe(shortDislikeButton, mutationObserver.options);
    } else {
      getLikeButton().style.color = getColorFromTheme(true);
      getDislikeButton().style.color = getColorFromTheme(false);
    }
  }
}

async function setState(storedData) {
  storedData.previousState = isVideoDisliked()
    ? DISLIKED_STATE
    : isVideoLiked()
    ? LIKED_STATE
    : NEUTRAL_STATE;
  let statsSet = false;

  let videoId = getVideoId(window.location.href);
  let likeCount = getLikeCountFromButton() || null;

  let response = await fetch(
    `${apiUrl}/votes?videoId=${videoId}&likeCount=${likeCount || ""}`,
    {
      method: "GET",
      headers: {
        Accept: "application/json",
      },
    }
  )
    .then((response) => response.json())
    .catch();
  cLog("response from api:");
  cLog(JSON.stringify(response));
  likesDisabledState =
    numberFormat(response.dislikes) == 0 &&
    numberFormat(response.likes) == 0 &&
    numberFormat(response.viewCount) == 0;
  if (response !== undefined && !("traceId" in response) && !statsSet) {
    processResponse(response, storedData);
  }
}

function setInitialState() {
  setState(storedData);
  setTimeout(() => {
    sendVideoIds();
  }, 1500);
}

function initExtConfig() {
  initializeDisableVoteSubmission();
  initializeColoredThumbs();
  initializeColoredBar();
  initializeColorTheme();
  initializeNumberDisplayFormat();
  initializeNumberDisplayRoundDown();
}

function initializeDisableVoteSubmission() {
  getBrowser().storage.sync.get(["disableVoteSubmission"], (res) => {
    if (res.disableVoteSubmission === undefined) {
      getBrowser().storage.sync.set({ disableVoteSubmission: false });
    } else {
      extConfig.disableVoteSubmission = res.disableVoteSubmission;
    }
  });
}

function initializeColoredThumbs() {
  getBrowser().storage.sync.get(["coloredThumbs"], (res) => {
    if (res.coloredThumbs === undefined) {
      getBrowser().storage.sync.set({ coloredThumbs: false });
    } else {
      extConfig.coloredThumbs = res.coloredThumbs;
    }
  });
}

function initializeColoredBar() {
  getBrowser().storage.sync.get(["coloredBar"], (res) => {
    if (res.coloredBar === undefined) {
      getBrowser().storage.sync.set({ coloredBar: false });
    } else {
      extConfig.coloredBar = res.coloredBar;
    }
  });
}

function initializeNumberDisplayRoundDown() {
  getBrowser().storage.sync.get(["numberDisplayRoundDown"], (res) => {
    if (res.numberDisplayRoundDown === undefined) {
      getBrowser().storage.sync.set({ numberDisplayRoundDown: true });
    } else {
      extConfig.numberDisplayRoundDown = res.numberDisplayRoundDown;
    }
  });
}

function initializeColorTheme() {
  getBrowser().storage.sync.get(["colorTheme"], (res) => {
    if (res.colorTheme === undefined) {
      getBrowser().storage.sync.set({ colorTheme: false });
    } else {
      extConfig.colorTheme = res.colorTheme;
    }
  });
}

function initializeNumberDisplayFormat() {
  getBrowser().storage.sync.get(["numberDisplayFormat"], (res) => {
    if (res.numberDisplayFormat === undefined) {
      getBrowser().storage.sync.set({ numberDisplayFormat: "compactShort" });
    } else {
      extConfig.numberDisplayFormat = res.numberDisplayFormat;
    }
  });
}

export {
  isMobile,
  isShorts,
  isVideoDisliked,
  isVideoLiked,
  getState,
  setState,
  setInitialState,
  setLikes,
  setDislikes,
  getLikeCountFromButton,
  LIKED_STATE,
  DISLIKED_STATE,
  NEUTRAL_STATE,
  extConfig,
  initExtConfig,
  storedData,
  likesDisabledState,
};